Zinc alloy and certain articles made therefrom



Patented Oct. 31, 19 33 I I UNITED STATES PATENT OFFICE ZINC ALLOY AND CERTAIN ARTICLES MADE THEREFROM Leland E; Wemple, Chicago, and John R. Daesen, Oak Park, Ill.

No Drawing. Application April 26, 1932 Serial No. 607,664

3 Claims. (01. 75 1 Cur invention relates to new and useful al- 01' spelter known as brass special or the grade loys o1 zinc whose advantages will be hereinknown as high grade or electrolytic zinc. after set forth, and to certain articles produced The exact proportion 01' copper and of silver from such alloys. The al ys are prepared by will depend upon the particular qualities of the 5 adding to 100 parts of .zinc from .025 to .245 alloy to be produced and also upon the various 1,789,854 we have claimed an alloy consisting simple experiment until the correct proportion Of 100 parts zinc, .25 to 2 parts of copper, and suitable for the desired alloy is determined.

Example I of such invention may be obtained if the propor- 1 Approximately 10,000 lbs. of-slab spelter, elec- .025 to .245 part and silver is present from .001 iron, cadmium and lead, are charged into a coalinvention may be rolled into sheets or strips skimmed oil. and 12 lbs. of copper in the form 7 zinc or known zinc base alloys, and such new and silver are thoroughly incorporated into the 8 or substantial extent. The low proportion of in a like manner as with ordinary zinc to form copper used renders the alloy much more ductile sheets or strips. so that it may more readily be used for the The alloy thus produced rolled in sheets to a manufacture of articles by extrusion and deep thickness of .0625" assays approximately as foldrawin h se Of silv r Wi hin th pr p rlows, and possesses physical properties'as listed 35. 1 8 a d serves o t ughen the a loy and below. For purposes of comparison, the assays thereby r n i fi ld of usef lness. and physical properties of pure electrolytic zinc The inc us d n he production of the alloy treated in the same manner are also listed below: may be a high grade zinc but for practical pur- Electroly- 40 mercial slab zinc or spelter which should, howhe Zinc ever, not contain ingredients which detrimentally affect the alloy. The presence 01' more than .6%

01 cadmium or .04% of iron renders the zinc too gggg brittle for rolling into thin gauge The pres- 006 46 ence of even a small trace of aluminum causes $33.?

the alloy, after rolling, to develop cracks and to Balancm: Balance as 50 .03%, maximum lead content .2%, and maxifgloolbs.

I substantially free from aluminum and 'magne- Example H sium. 55 We may, however, use to advantage the grade 1,000 lbs. 01 commercial electrolytic spelter no gauge.

The finished sheets assay approximately as follows and possess the physical properties indicated:

Electrolytic zinc Iron None Copper.-- None Silver 006 Lead.-. Trace Cadmium Trace Zinc Balance"... Balance Physical properties of rolled sheets Gauge .04" Tensile 29 200 lbs 22,100 lbs Rockwell hardness. 60 Dynamic ductility 460 4A0 Leas es It will be noted that the hardness of our alloy is substantially greater by the Rockwell scale than ordinary rolled zinc and that the tensile strength of our alloy that of electrolytic zinc. ductility of the alloy, as indicated by the readdynamic testing ma hine and on the shows that the increase has been obtained without any material change in ductility.

Having thus described the invention, what we claim as new and desire to secure by Letters Patent of the United States is:

We claim:

1. As a composition of matter, an alloy consistins principally of zinc, from .025 to .2415 part of copper and from .001 to M5 part 2. A tertiary zinc-base alloy consist g of parts of zinc, .025 to .245 part of copper, and .001 to .245 part of silver.

3,. As a new article of manufacture, a mechanically worked zinc product made of a zinc-base alloy composed of zinc 100 parts, copper .025 to 2% part, and silver from .001 to .245 part.

LELAND E. WEMPLE. JOHN R. DAESEN. 

